wave_get_read_position is not used, so remove it

src/libespeak-ng/wave.c

 int wave_port_close(void *theHandler);
 int wave_port_is_busy(void *theHandler);
 void wave_port_terminate();
-uint32_t wave_port_get_read_position(void *theHandler);
 uint32_t wave_port_get_write_position(void *theHandler);
 void wave_port_flush(void *theHandler);
 void wave_port_set_callback_is_output_enabled(t_wave_callback *cb);
 int wave_pulse_close(void *theHandler);
 int wave_pulse_is_busy(void *theHandler);
 void wave_pulse_terminate();
-uint32_t wave_pulse_get_read_position(void *theHandler);
 uint32_t wave_pulse_get_write_position(void *theHandler);
 void wave_pulse_flush(void *theHandler);
 void wave_pulse_set_callback_is_output_enabled(t_wave_callback *cb);
 		wave_port_terminate();
 }
 
-uint32_t wave_get_read_position(void *theHandler)
-{
-	if (pulse_running)
-		return wave_pulse_get_read_position(theHandler);
-	else
-		return wave_port_get_read_position(theHandler);
-}
-
 uint32_t wave_get_write_position(void *theHandler)
 {
 	if (pulse_running)
 #define wave_close wave_port_close
 #define wave_is_busy wave_port_is_busy
 #define wave_terminate wave_port_terminate
-#define wave_get_read_position wave_port_get_read_position
 #define wave_get_write_position wave_port_get_write_position
 #define wave_flush wave_port_flush
 #define wave_set_callback_is_output_enabled wave_port_set_callback_is_output_enabled
 	Pa_Terminate();
 }
 
-uint32_t wave_get_read_position(void *theHandler)
-{
-	(void)theHandler; // unused
-
-	return myReadPosition;
-}
-
 uint32_t wave_get_write_position(void *theHandler)
 {
 	(void)theHandler; // unused
 {
 }
 
-uint32_t wave_get_read_position(void *theHandler)
-{
-	(void)theHandler; // unused
-
-	return 0;
-}
-
 uint32_t wave_get_write_position(void *theHandler)
 {
 	(void)theHandler; // unused

src/libespeak-ng/wave.h

 extern void wave_flush(void *theHandler);
 extern int wave_is_busy(void *theHandler);
 extern void wave_terminate();
-extern uint32_t wave_get_read_position(void *theHandler);
 extern uint32_t wave_get_write_position(void *theHandler);
 
 // Supply the remaining time in ms before the sample is played

src/libespeak-ng/wave_pulse.c

 #define wave_close wave_pulse_close
 #define wave_is_busy wave_pulse_is_busy
 #define wave_terminate wave_pulse_terminate
-#define wave_get_read_position wave_pulse_get_read_position
 #define wave_get_write_position wave_pulse_get_write_position
 #define wave_flush wave_pulse_flush
 #define wave_set_callback_is_output_enabled wave_pulse_set_callback_is_output_enabled
 	pthread_mutex_destroy(a_mutex);
 }
 
-uint32_t wave_get_read_position(void *theHandler)
-{
-	(void)theHandler; // unused
-
-	pa_timing_info a_timing_info = {0};
-	pulse_playing(&a_timing_info);
-	return a_timing_info.read_index;
-}
-
 uint32_t wave_get_write_position(void *theHandler)
 {
 	(void)theHandler; // unused

src/libespeak-ng/wave_sada.c

 	my_callback_is_output_enabled = cb;
 }
 
-// wave_get_read_position
-//
-// DESCRIPTION:
-//
-// Concerns the sample which is currently played by the audio layer,
-// where 'sample' is a small buffer of synthesized wave data,
-// identified so that the user callback could be called when the
-// 'sample' is really played. The identifier is returned by
-// wave_get_write_position.  This method is unused.
-//
-// PARAMETERS:
-//
-// theHandler: the audio device file descriptor
-//
-// RETURNS:
-//
-// The total number of 16-bit samples played by the audio system
-// so far.
-//
-uint32_t wave_get_read_position(void *theHandler)
-{
-	audio_info_t ainfo;
-	ioctl((int)theHandler, AUDIO_GETINFO, &ainfo);
-	return ainfo.play.samples;
-}
-
 // wave_get_write_position
 //
 // DESCRIPTION: